Calculating machine



A. F. POOLE CALCULATING MACHINE Filed Dec. 10, 1917 11 Sheets-Sheet 1Feb. 12 1924.

A; F. POOLE CALCULATING MACHINE Filed Dec. 10

11 Sheets-Sheet z Feb. 12 1924.

A.F.POOLE CALCULATING MACHINE l 1917 ll Sheets-Sheet 5 Filed Dec.

Feb. 12 1924.

A. F. POOLE CALCULATING MACHINE Filed Dec. 10, 1917 ll Sheets-Sheet 41Feb. 12 1924. 1,483,678

A. F. POOLE CALCULAT I NG MACHINE Filed Dec. 10 1917 ll Sheets-Sheet 5 iU i i s Feb-12", 1924.

A. F. POOLE CALCULATING MACHINE Fi1ed.Dec. 10, 1917 11 Shah-Sheet Feb.12 1924 1,483,678

' A. F. POOLE CALCULATING MACHINE Filed Dec. 10, 1917 11 sheets-SheetFeb. 12 1924. 1,483,678

A. F. POOLE CALCULATING MACHINE Filed Dec. 10, 1917 11 Sheets-Sheet 8260 24a @afi 16,7 fiifi Zj- 7 Feb. 12 1924. I A. F. POOLE CALCULATINGMACHINE Filed Dec. 10, 1917 11 s m t 9 Feb. 12 1924. 1,483,678

A. F. POOLE CALCULATING MACHINE Filed. Dec. 10 1917 11 sheets-sheet 10Feb. 12 1924.

A. F. POOLE CALCULATING MACHINE Filed Dec.

11 Sheets-Sheet 'u Patented Feb. 12, 1924.

UNITED STATES PATENT OFFICE.

ARTHUR I. POOLE, OI KENILWOBTH, ILLINOIS, ASSIGNOB, BY IESNEASSIGNMENTS,

T REMINGTON ACCOUNTING MACHINE CORPORATION, OF YORK, N. Y., A COB-PORATION 01' NEW YORK.

CALCULATING MACHINE.

Application filed December 10, 1917. Serial No. 208,452.

To all whom it may concern:

Be it known that I, ARTHUR F. POOLE, a v citi n of the United States.and resident of Ken] worth, in the county of Cook and State 5 ofIllinois, have invented certain new and useful Improvements inCalculating Machines, of which the following is a specification.

M invention is an improved calculating mac ine, designed particularly tohandle the problem of writing customers statements and individual ledgeraccounts for banks There are many other uses to which my invention maybe put and many forms of accounts which can be handled to advantage onit. But my invention is designed with the particular problem mentionedin view, 'and in. the course of the following description ofmy inventionI shall confine myself solely to its use in the bank problem, al-

though it is to be understood that there is a lar e number of otherforms of accounts to ca culate which my hereinafter described machinecan be used with equal advantage. The bank problem referred to isusually Written according to the following form:

A B c D Total Deposits. Prlor Current checks. balance. balance.

Checks.

and the arithmetical calculations on the numbers involved areOccasionally an additional column A is used to write the total checksentered in any day. In this event numbers written in column A are notincluded in the calculation but are simply copied from the totalizer. Myinvention may be described generally as a typewriter adding machinehaving a single jumping totalizer into which numbers are insertedseriatim by a master wheel and which is adapted to be brought intocooperation with numbers written on any zone of the worksheet andtherefore can be used to compute numbers which are written in horizontalarrangement. The totalizer is further an algebraic one, that is, it willshow the correct resultant'of a series of positive and'negative numbers.

The direction in which numbers set up on the ke sare entered into thetotalizer is controlle automatically by a set of cams traveling with thetypewriter carriage, there being a separate cam for each zone ofcalculation or column of numbers. One may set up a definite program ofcalculation as the typewriter carriage moves across the variouscalculating zones and the connections between the keys andthe totalizerwill be automatically changed during the progress of the carriage, tothe end that numbers written in some columns will be entered into thetotalizer in addition, numbers written in other columns will be enteredinto the totalizer in subtraction and numbers written in other columnswill not be entered into the totalizer at all.

In addition to the above described automatic control, my hereindescribed machine is also provided with a manual control and a meanstoshift from one to the other. It is sometimes desirable when a givenprogram of calculation has been set up on the carriage to use themachine tem rarily to calculate aform difierent from't at determined bythe automatic set up. For the handling of such cases I have provided ameans to throw the machine into manual control and when in manualcontrol to determine that the totalizer shall operate either in additionor subtraction.

My invention further includes the provis1on of novel means for reversingthe connectlon between the numeral keys and the totalizers for the purse of correcting an erroneous insertion; en a wrong number is insertedin the machine, for' instance, a 527 is printed instead of the correctnumber 827, the usual procedure to correct the error is to reverse theconnection between the keys and the totalizer, reinsert the erroneousnumber, thus cancelling the previous insertion; the printing on the worksheet is then erased, the machine is put in its original, condition. andthe-correct number inserted. As explained above, the control of my maybe either manual or automatic, and either control ma be in any oneofthree conditions viz'.,- a dition, subtraction or disconnect. lhedetermination of the proper levers to operate in order to throw themachine into'the reverse of any one of these six conditions would besomewhat complicated and I have therefore provided a single hereinafterdescribed machine universal reversing lever which when placed in itsalternative position will reverse the previously-existing connectionsbetween the keys of the machine and the totalizer. While this feature ofmy invention is covered broadly in a patent of mine, yet the applicationof it to my present machine is novel.

The cams forming the automatic set-up are mounted on a bar which floatsin reference to the carriage of the typewriter. This is for the purposeof insuring that the cams shall at all times be accurately spacedvertically in reference to the gear shifts while at the same timeallowing the utmost freedom of motion of the typewriter carriage, Thcams themselves are also of improved structure. in that they are readilyadjustable to determine that the totalizer shall operate in addition,disconnect or subtraction and the cams themselves are mounted on a framewhich is supported, by the floating bar and can be readily adjustedlengthwise thereof. The same structure which supports the cams alsoprovides pickup lugs for the jumping totalizer and I have greatlyimproved this pickup mechanism in several particulars, which will behereinafter fully set forth.

The algebraic totalizer herein employed is quite an advance over thosedescribed in the prior art in that the insertion of the one necessary toshow the correct resultant is performed, not by auxiliary mechanism ashas been the case heretofore, but is inserted through the medium ofthemaster wheel and the keys of the calculating machine.

The totalizer is so arranged that in case it changes from a positive toa negative re-,

sultant, or vice versa, no number is visible. In order to make a numbervisible, it is necessary to operate a special key, located on thekeyboard, and the operation of this special key adds a unit into thelowest place of the totalizer by means of the master wheel and alsoshifts certain shutters or masks which have been concealing theexhibiting number. The correct result-ant, both as to magnitude andalgebraic Sign is then displayed.

My herein described invention further includes; the provision ofautomatically exhibited legends connected with the algebraic t talizer,which inform the operator both of the character of the indicated number,that is whether said number is a positive or negative total, and also,at other times, in-

form the operator of the necessity to make certain operations at variousstages in the calculation.

My herein described invention contains additional improvements in themechanism of said special key as it is related to the ordinary numeralkeys of the typewriter. Said improvements include an interlock for saidspecialkey, to the end that it can not be operated, except when thetotalizer is in the proper position, at which time the ordinary numeralkeys of the typewriter are locked.

In handling the bank system form, the number in column D (supra) may bean overdraft, in which event the overdraft would be shown on thealgebraic totalizer as a negative quantity. Under these circum stances,in order to clear the machine, it is necessary to throw the universalreverse lever previously referred to and clear the machine by operatingin addition. It is, of course, desirable to have some indication on theworksheet that an overdraft is present, both for the purpose of callingthe attention of the bank officials to the matter and also for thepurpose of information of the machine operator who handles thisstatement the next day. In picking up the previous days balance, whensaid balance was n overdraft it is of course necessary to enter thisoverdraft in the totalizer in a subtracting direction and it is verydesirable to have both these overdrafts when they occur either in thecurrent balance column (column D supra) or in the rior balance column (Csupra) strikingly visible, so that the operator may be clearly guided inentering these overdrafts into the totalizer in the proper direction.

From the above it is apparent that whenever an overdraft is handled,either by way of clearing it from a totalizer or entering it into thetotalizer as is done when the prior days balance is picked up, it isnecessary to operate the universal reverse lever. In order to make theprinting of these overdrafts characteristic, I have connected theuniversal reverse lever with the color shift of the typewriter, so thatoperating the universal reverse lever simultaneously shifts the ribbonfrom its customary color, for instance black, to its distinctive color,for instance red. I believe that this combination of an algebraictotalizer and universal correcting lever for the same and a connectionfrom said universal correcting lever to a cOlOr shift is broadly new andI consider it a very essential portion of my invention.

My herein described machine is a. further improvement over those of theprior art in that I have provided a species of carriage lock for ajumping totalizer machine. This carriage lock is operative on the mainwriting carriage of the typewriter and prevents the shifting of the samewhile a numeral key is depressed. I believe I am the first to show asingle jumping totalizer machine equipped with the above described lock.

My herein described invention further discloses an improved pick-up andrelease mechanism for the jumping totalizer which is designed to reventthe jumping totalizer from running a ead of the main carriage and lotssupporting frames,

to maintain said totalizer in exact correspondence with the maincarriage while said main carriage is traversing a calculating zone. Thejum ing totalizer is provide with an adjustahle stop which determinesthe normal position of said totalizer and this stop is connected to thepick-up and release mechanismso that there is no interference with themain carria e of the typewriter which is accordingly ree to be moved inits reverse or backspace direction when the totalizer is resting againstits backstop.

Another object of m invention is the provision of an adjustab e stop todetermine the normal position of the jumping totalizer carriage, whichstop will cooperate with the pick-up and release mechanism above referred to. This adjustable stop is so designed that .it can be adjustedto any width 0 totalizer and at the same time will automatically operateportions of the pick-up and release mechanism to correspond to thischanged adjustment.

A further object of my invention is the provision of a special interlockbetween the decimal carriage, the digit keys of the typewriter and theadjustable stop referred to above, to the end that if the decimalcarriage becomes accidentally disconnected from the moving carriage ofthe typewriter before a number has been completely written thecalculatin machine is locked. On the other hand, w on said decimalcarriage is disconnected from the main carriage and the calculatingmachine is not in a computing zone, the digit keys of the typewriter maybe operated as usual.

A further object ofmy invention is theprovision of a certain restoringlever which is designed to release the actuatin mechanism in case itbecomes accidental y locked b reason of an erroneous manipulation tereof. Owing to the complicated nature of this machine, it is necessarythat this restoring lever compel the parts to return to their normalposition in-a certain c cle in order to avoid introducing an ad itionalerror by the act of restorin the machine to its normal position. To t isend I have provided said lever with a series of interlocks so that whenthe said lever is used. certain parts of the mechanism must return totheir normal position in a cycle as determined by the lever and itsassociated mechanism.

Another object of my invention-is the provision of an interlock betweensaid lever and the digit keys of the typewriter, to the end that it .isimpossible to operate any of the digit keys until the parts controlledby the restoring. lever have been returned to their normal position. 1 a

A further object of my invention is th provision of certain novel camandpick up these frames including .position on the cam bar ed out andreferred the digit keys, jumping totalizer and the frames themselves,and also the pick-up lug by means of which connection is made betweenthe carriage of the typewriter and the jumping truck upon which ismounted the totalizer. I have mounted these frames on the floating cambar previously referred to and have taching means, to the end that theframes may be. readily adjustable to any desired and securely held intheir adjusted position.

provided said frames with at- A further object of my invention is theprovision of'an improved latch structureserving to connect thetypewriter carriage and the subsidiary decimal carriage or truck onwhich the totalizer is mounted. The novel features of this latchstructure will be more full explained in the followin specification: l tmay be said generall tiat its flll'lClSlOIIilS to prevent accidental cisengagement'ofthe subsidiary decimal carriage fromxthe typewritercarriage regardless of how the latter may be moved. This latch structurealso includes novel means for preventing interference between thetypewriter carriage and the subsidiary decimal carriage when the latteris in its normal position.

A further object ofmy invention is the provision of certain structuraldetails of the actuator and mounting for the jumping decimal carriage,to'the end of providing a structure which will be easy of assemblage andin which the parts will be rigidly held in their proper positions. Theseandother structural details will be more fully pointto in the followingspecification and claims.

' My invention may be best understood by reference to the accompanyingfigures, of whichi Fig. 1 is a front elevation of the complete device ona typewriter;

Fig. 2 is a side elevation of the complete device on a typewriter;

Fig. 3 is a front elevation of'the actuator, enlarged, and with thecover removed;

Fig. 4 is a rear elevation of Fig. '3;

Fig. 5 is a right side elevation of a portion of Fig. 3;

Fig. 6 1s a section on the line 66 of section Fig. 11 is a rear view ofthe totalizer truck;

Fig. 12 is a perspective view of the mechanism on the floating truck andcooperating parts;

Fig. 13 1s a perspective view of an adjustable cam and its mounting;

Fig. 14 is a perspective view of mechanism shown in Fig. 4;;

Fig. 15 is a section on the line 15-15 of Fig. 3;

Fig. 16 is a section on the line 16-16 of Fig. 15;

Fig. 17 is a section on the line 17-17 of Fig. 15;

Fig. 18 is a perspective view of the totalizer shutter mechanism;

Fig. 19 is av section on the line 19-19 of Fig. 16;

Fig. 20 is a detail of lever 105;

Fig. 21 is a detail of support 108 for lever 105, and

Fig. 22 is a section on the line 22-22 of Fig. 3.

Similar numerals of reference refer to like parts throughout all thefigures.

The preferred form in which I have shown my invention is in connectionwith the well-known Wahl typewriter adding mechanism, in fact, I haveused a great deal of the lVahl mechanism in carrying out my invention,although my invention is by no means limited to be used in the preciseform disclosed by me in the followin specification.

Tieference' to Figs. 1 and 2 disclose that my mechanism is mounted on aRemington typewriter which is provided with the customary ten digit keys31, each of which is connected by a pull rod 32 acting on a rocker 33,pivoted at 3 1 on the framework 29, and which is also connected by apull rod 35 to a type bar 36 pivoted at 37 on the framework 27, andprovided with the proper printing type 38 for printing on a platen 39. Auniversal rod 40 is suspended by a pair of links 41, (of which but oneis shown in Fig. 2) from the arms 42 rigid on a shaft 44 pivoted to theframework 29. Rigid with the shaft 44.- is an arm 43, from which leads arod a5 to the escapement rocker 46, which is pivoted to the framework at47 and engages the twin escape wheels 48 of the usual Remingtonescapement.

It is to be understood that the typewriter is also rovided withalphabetical printing keys. Fhave not shown any of these keys for thereason that they are not connected with the calculating mechanism andindeed in some cases, for example in handling the bank problem referredtofabove, the presence of alphabetical printing keys is superfluous.When these alphabetical keys are present, each of said keys actuates theuniversal escapcment rod 40 in the same manner as the digit keys 31.

In addition to the digit keys 31, I have also provided aspecial key 50,which is connected by a pull rod 19 to the computing actuator. Thisspecial key 50 is not provided with a pull rod 32 and has no type barconnected therewith. Said key has to do with certain operationsconnected with the algebraic totalizer and the mechanism connecting saidkey to the totalizer will hereinafter be fully described.

My improved machine consists primarily of an actuator which is containedbetween two end side plates 279 and 280. which are mounted on a casting281, which serves as the foundation support for the calculatingmechanism. Said casting is attached by suitable means (not shown) tobrackets on the typewriter 30. The casting 281 also furnishes a supportfor a certain reciprocating truck 221 (Fig. 3) which serves as thetotalizer mounting and said casting also supports the intermediate sideplates 282,283, and 284, between which certain other portions of theactuator mechanism are pivoted. The actuator casting 281 further servesas a support for the cam bar 172 (Fig. 3),

which is supported from a pair of rollers 178 and 179 (Fig. 2), all ofwhich will be hereinafter more fully described.

Numbers are inserted into my improved machine by a set of digit keys 31,and the motion of these keys is transferred to a series of fans 52 by aseries of pull rods 51. There is one of said fans attached to each ofthe pull rods 51, and also to the pull rod 49. All of the fans 52 arerotat-ably mounted on a shaft 53, which is fixed in the framework 279,280, 281. Reciprocation of any of the digit keys results in acorresponding reciprocation of the attached fan 52, and eventuallyresults in the differential rotation of a master wheel 54 (Figs. 1, 3, 7and 9) which is rigidly mounted on a shaft 55, which rotates in theframe plates 282 and 284. On the first part of the downward motion ofany of the digit keys 31, certain universal actions take place in theactuating mechanism, that. is, actions which are the same both in timeand extent for any of the digit keys 31. Amon these actions are theaction of a front ful stroke pawl 56, which is rotatably mounted in theframework of the machine and is held by a spring 57 extending betweensaid pawl and the back full-stroke pawl 58 into the ath of a series ofteeth 59 cut on each of the fans 52. During said preliminary portion ofthe numeral key stroke the back full-stroke pawl 58, which is. alsorotatably mounted in the framework, is thrown out of the path of a setof teeth 60, which are present on each one of the fans 52. The

action of these full-stroke pawls has been thoroughly described in theissued patents to John C. Wahl, Nos. 893,719 of July 21, 1908 and1,270,471 of June 25, 1918, reference to which may be had for furtherinformation on this subject.

The universal actions on the first part of the key cycle also includethe counterclockwise rocking of a (ertain master dog 61, (Fig. 9) whichis mounted on a shaft 62 rotatably mounted in the framework and which,when actuated, serves to unlock the gear chain in the totalizer Themaster dog 61 is actuated by means of a roller 63 attached thereto,which in its turn is actuated by a cam slot 64 in a rocker 65 on a shaft66 rotatably mounted in the framework. The rocker 65 has mounted on it astud 67 engaging with which is a link 68 which serves to connect saidstud with a rockshaft 69 rotatably mounted in the framework. Mounted onthe rockshaft 69, by arms 285, and rigid'with said shaft is a rod orbail 70, which extends" in the path of the heels 71 of the fans 52. Whena digit key 31 is depressed, the consequent rotation of the fan 52 willbring the heel 7 into contact with the bail 70. The rockshaft 69 willthereupon be rotated in a clockwise direction (Fig. 9) and rotation ofthe rocker 65 will conse quently take place. The cam slot 64 will thenmove the roller 63, thus maintaining the master dog 61 in itsalternative position. These actions have been thoroughly described inthe patent to Wahl, No. 1,148,733 of August 3, 1.915, and therefore neednot be described in greater detail here.

Each of the fans 52 is provided with a slot 72, which is adapted toengage a pin 73, mounted in a gooseneck 74, which is rotatably mountedon the shaft 53. There isa gooseneck 74 associated with each of the fans52 and each of the goosenecks 74 has a cam surface 286 and a concentricslot 287 which are adapted to engage one of'a series of rollers 75,which are'supported by arms 76 from a sector shaft 77. .The arms 76 aremounted on the shaft 77 in spiral arrangement and therefore theoperation of any of the digit keys 31 will rotate the sector shaft 77 adifferential amount. The rollers 75 are so arranged that when the l-keyis operated, the shaft 77 will be rotated one space; when the 2-key isoperated said shaft will be operated two spaces, etc.

The differential rotation of the sector shaft 77 is transformed into adifferential rotation of the master wheel 54 by the wellknown Wahlhelical cam and sector mech anism, for a description of which referenceto the cited patent of Wahl, No. 1,148,733, will be of advantage. Theresult of this 3), which is pivotally mounted at 79 on the i sectorshaft 77 is moved by a shiftable plate 80 from the position shown in Fi3 to a. position where said sector is at rig t angles to the sectorshaft 77. This shifting of the position of the sector relative to theshaft 7 7 is done by the rocking of the universal shaft 69 on the firstpart of the downstroke of any of the numeral keys. When the sector 78 isin its right-angled position just describedyit may he in mesh eitherwith a direct gear 81 or a reverse gear 82 (Fig. 7) according to theposition of said gears. The direct gear 81 has a tongue 83, which is inslidable engagement with a fork 84, rigid to the master wheel 54. Thereverse gear 82 is rotatably mounted on a gear shift rod 85 and is heldfrom shifting laterally relatively thereto by washers 86 a 87 mounted onsaid rod. The rod 85 is $1 ably mounted in the side plate 282, which isrigid to the framework and has a portion of reduced diameter 89 whichslides in a hole in the side plate 283, also rigid to the framework.Mounted on the side plate 282 is a stud 91, pivotally mounted in whichat 92 is a lever 93 having a connection by means of a stud 94 to a cut95 on the underside of the washer 86 (Fig. 7). The hub of the directgear 81 has a slot 96 cut therein and said slot is in engagement with astud 97, mounted on the rocker 93. It will thus be evident that shiftingof the gear shift rod 85 will result in the shifting of the direct gear81 .and the reverse gear 82 in opposite directions. These gears havethree possible positions. One is the position shown in Fig. 7 in whichthe reverse gear 82 is in a 051- tion to be'engaged by the sector 78. isposition of the gears determines that the master wheel 54 shall rotatein a direction to determine subtraction in the totalizer. The secondposition of the gears 81 and 82 is a position in which the two gears aresubstantially in line and neither of them will be engaged by the sector78 when the same is actuated. This corres nds to a disconnect positionof the machine and in this case any number entered by the digit keyswill simply be printed on the worksheet without being entered into thetotalizer. The third position of the two gears is the position when thegear shift rod 85 is drawn to its extreme lefthand position (Fig. 7) andwhen in said position the direct gear 81 will be engaged by the sector 78. This is the addition position of the machine.

From what has been said, it will be obvious that de ression of any ofthe digit ke 31 will resu t in the master wheel 54 and t a master dog 61operating in the following cycle: During the first part of the motion ofthe key the master dog 61 is rocked in a counter-clockwise direction,after which the mechanism is that a certain sector 78 (Fig. master wheel54 is rotated a diflerentifl amount, whose extent is determined by theparticular numeral key which has been opcrated and whose direction isdetermined by the position of the gear shift rod 85. I shall hereinafterdescribe the mechanism for determining the position of said gear shiftrod.

After the numeral key has reached the bottom of its stroke, theuniversal bail (Fig. 9) snaps off the heel of the fan 52, being thusmoved by a sector spring (not shown) which serves to hold the rockshaft69in its normal position, as shown in Fig. 9. On the upstroke of thekey, the snapper 78 is thrown out of mesh with the gear gaged by itduring the downstroke of the key and the upstroke of the key isaccomplished without any further motion of the master wheel 54. Thisaction is also described in the Whal Patent 893,719 supra.

The gear shifts.I have now described the mechanism by means of which themaster wheel 54 is rotated an amount whose extent is determined by theparticular numeral key depressed and whose direction is determined bythe gear shift rod 85. It is obvious that when the master wheel 54rotates in one direction it will determine addition in the totalizer andwhen it rotates in the opposite direction it will determine subtraction.Furthermore, I have provided an intermediate position for use in certainclasses of calculation in which a depression of a digit ke will notrotate the master wheel at all, but t 1e number will simply be rinted onthe platen without being entere into the totalizer. My mechanism is sodesigned that this disconnect position corresponds to an intermediateposition of the gear shift rod 85. In orderto determine the position ofthis gear shift rod, I have provided three distinct mechanisms, any oneof which, either by itself or acting in conjunction with one'of theothers, is sufiicient to determine the position of the gear shift rod85. The first of the various mechanisms just recited is an automaticcontrol, which consists of a series of cams mounted on the cam bar 172which travels step by step with the advance of the typewriter carriage.These cams contact 'with a pair of complementary rollers on the gearshift rod at all but throws said rod under the automatic control of thepreviously mentioned cams mounted on the cam bar 172. The mechanism bywhich said cams act on the gear shift rod 85 will hereinafter be fullydescribed. The lower position of the handle 98 determines that the gearshift rod shall be in a position determining subtraction by the masterwheel 54 whenever any of the digit keys 31 are depressed.

The third way of controlling the gear shift rod 85 is by means of thecorrecting handle 160, which and its connections will be describedhereinafter.

I shall now proceed to describe the differ ent mechanisms by which thegear shift rod 85 is located as above described. Considering theautomatic mechanism first, reference particularly to Fig. 14, in whichis shown a perspective view of the various gear controls, will disclosethat the rod 85 is connected by a pin 99 to the lever 100, which isrigid on a shaft 101 rotatably mounted in the actuator casting 281 andextending through the same. On the rear end of said shaft is mounted acrank arm 102, ri id in which is a pin 103, which is adapted to be movedby a V-shaped slot 104 in a floating cam plate 105. The location of saidplate is controlled by the joint action of two pivots, first that of apin 106, which is constrained to move in a vertical slot 107 (Fig. 21)in a plate 108 supported on the back of the actuator casting 281. Thepin 106 is riveted into a link 109, and said pin passes through a slot110 in the -floating cam plate 105, the slot 110 being parallel to thelength of the cam plate 105. A pin 112 is riveted in the rear end of thefloating cam plate 105 and is constrained to move in a vertical slot 111in the plate 108 (Fig. 21), said plate being fastened to the actuatorcasting 281 by screws 113 and 114. The pin 112 may be acted on by eitherof two agencies, first by a plate 115, which contains a slot having awide portion 116, a portion 117 which is just the width of the pin 112and an end portion 118, wh ch, like the portion 116, is wide enough topermit the pin 112 to be actuated by the second source of control forsaid pin. Leaving out of consideration for a moment this second control,reference to Fig. 14 will disclose that the plate 115 is pivoted at 119to a bell crank 120, which is rotatably mounted on a stud 121 rigid onthe framework. Mounted on the bell crank 120 is a stud 122, mounted onwhich is a roller 123, which is adapted to be actuated by the travelingcams hereinafter to be described. The depending arm of the bell crank120 is connected by a link 124 to a dependin arm 125 of a bell crank 126ivoted to the ramework on a stud 127 an having mounted on its horizontalarm a roller 128. The length of the link 124 is such that when theroller 123 is lowered the roller 128 is raised the same amount and viceversa, so that the motions of the two rollers 123 and 128 arecomplementary to each other. Obviously the motion of the rollers willdetermine the up and down position of the pivot 119 of the plate 115 andin the event that said plate is swung about the pivot 119 to 'such aposition that the pin 112 will register with the narrow portion 117 ofthe slot in the plate 115 then the motion of the rollers 123 and 128will completely control the position of the pin 112 and con uently theposition of the left end of the aoating cam late 105.

I s all now describe the means by which the pin 112 is controlled fromthe handle 98. On the opposite side of the floating cam plate 105 fromthe plate 115 is a second plate 129 which is pivoted to the framework ona stud 130. Said plate 129 has in it a slot 131 having a wide centralportion 132 and narrow end portions 131 vand 133. The position of theend portions 133 and 131 is such that when the pin 112 is engaged bythem it is thrown into either of its alternative positions, that is,when engaged by the end 133 it is thrown into osition determining thatsaid pin 112 shall be in its upper position (Fig. 14) and when the end131 engages the pin 112 said pin is thrown into its lower position, theends 116 and 118 in the plate 115 being wide enough to permit suemotion. The plate 129 is shifted from one position to another by meansof a pin 134. The in v134 is riveted to a link 135 and exten s through ahole 137 in the plate 129. The pin 134 also engages a slot 136 in theplate 115, said slot being of suflicient length to permit the motion ofthe plate 115 as determined by the motion of the bell crank 120. Thelink 135 is pivoted on a stud 138, which is mounted on a rocker 139,rotatably mounted on the framework on a stud 140. The.

rocker 139 contains a slot 141 enga 'ng in which is a stud 142, mountedin t 'e end of a lever 143, which is pivoted to the, framework on a stud144 and is connected by a twisted link 145 to the rear endpf the handle98, which in its turn is pivoted to the framework on a stud 146. Anescutcheon plate 147 is provided for the lever 98 and has three recessesor locations therein, said lever being held by a spring (not shown) toengage any one of said locations, thereby preventing accidental shlftlngof said lever. When the lever 98 is in its middle position, the plates115 and 129 are in a position in which the pin 112 is in engagement withthe narrow part 117 of the s ot in plate 115 and o poslte the wide rtion132 of the slot in t e plate 129. on the lever 98 is in either of itsextreme positions,

the pin 112 will be located by either of the ends 133 or 131 of the slotin the plate 129 and the wide portions 116 or 118 of the slot in theplate 115 will ermit the plate 115 to be moved ,up and own with-. outinterference with the pin 112.

Obviously the. pin 112 may thus be located from either of two sources,first, from the complementary rollers 123 and 128 and second from thehandle 98. When said handle is in its middle position it determines thatthe pin 112 is controlled by the complementary rollers 128 and 123. Whenthe handle is in either of its extreme positions it determines that thepin 112 is located by the plate 129. The ends 133 and 131 of the slot inplate 129 are so arranged that the pin 112 is located in a positiondetermining addition when the handle 98 isin its uppermost position(Fig. 3) and in a position determining subtraction when said handle 98is in its lowermost position (Fig. 3).

When the parts are in the position in Fi 14, the gear shift rod 85 isshown in itsa dition position. Obviously if the plate 129 should beshifted so that the end 131 of the slot therein controls the position ofthe pin 112, the floating cam plate 105 would be rocked about the pivot106 and the pin 103 would occu y the middle portion 148 of the slot 104.This would result in the rocking of the shaft 101 and the consequentshifting of the gear shift rod 85 from its subtraction position.

I shall now describe the third way of controlling the odd and subtractfunction,- which is by the action of the pin 106: As before noted, saidpin is constrained to move in a vertical slot in the plate 108 (Fig. 21)and is riveted in the link 109, said link being pivoted on the end of ahorizontal arm 149 of a bell crank 150, pivoted on the stud 140previously referred to. The depending arm of said bell crank has rivetedtherein a pin 151, connected to which is a spring 152, the other end ofwhich is connected to a stud 153 in a link 154, said link having a slot155 therein which engages a forwardly extending portion of the pin 151,previousl referred to. The link 154 has in its right and end (Fig. 14) astud screw 156, which engages a slot 158 in a bell crank 157, said bellcrank bein mounted on the stud 144 reviously re erred to. The bell crank15 is connected by a twisted link 159 to a universal correcting lever160 (Figs. 3 and 4). Said lever is pivoted to the framework on a stud161 and is held in its normal position by a spring 162. When said leveristhrown to its alternate position a latch 163 is provided to retain itin said position. The parts 162 and 163, just referred to, are the sameparts as parts 362 and 364 in Fig. 5 of the patent to Web], No.1,270,471.

The locations of the pins 106 and 112 and its addition to the travel ofthe universal correcting lever 160 are so proportioned that motion ofsaid lever and consequent motion of the pin 106 will displace thefloating cam plate 105 an angular distance about the pin 112 equal tohalf of the angle subtended by the extremities of the slot 104.Obviously displacement of the cam plate 105, by motion of the pin 106,will throw the pin 103 into a position which is determined by the slot104 moving through half of its angular length. Inspection of Fig. 14will disclose that if the pin 103 is in the position shown in saidfigure, that is, in the addition position, displacement of the pin 106by the motion of the correcting lever 160 will bring the pin 103 intothe portion 148 of the slot 104, that is, into its subtraction position.Therefore, the machine will be reversed.

If the pin 103 is half way up the slot 104, thus corresponding to adisconnect position, motion of the pin 106 will bring the pin 103 halfway down the slot 104, on the other side of the hump 148, that is, itwill bring the pin 103 into a second disconnect position. If the pin 133occupies the portion 148 of the slot 104, motion of the pin 106 willbring the pin 103 into the lower portion 164 of the slot 104, that is,the pin 103 will be shifted from the subtraction position to theaddition position. Obviously the pin 106 may be moved irrespective ofthe position or state of control of the pin 112, and therefore theuniversal correcting lever 160 may be operated when the lever 98 and therollers 123 and 12-8 are in any of their possible positions and whenoperated will throw the machine into the reverse of its previouscondition.

I consider this universal correcting lever or" great advantage. The mostconvenient way to correct an erroneous insertion in the adding machineis to-throw the machine into the reverse of its previous condition,re-inserting the erroneous number, thereby cancelling the firstinsertion, then throwing the machineto its original position andinserting the correct number. Obviously when a machine may beeither.under manual or automatic control, if one had to manipulateditferent levers to reverse the machine in order to correct the error,such manipulation would be ver inconvenient and liable to error. In myerein described machine I have provide a single correcting lever, which,when operated, will place the machine into the reverse of its previouscondition. I consider this a feature of great importance. The principleof the device is somewhat the same as the principle of a device for asimilar purpose on a two-totalizer machine shown in one of my copendingapplications. However, the mechanism disclosed in my presentspecification t0 accomplish this result is much simpler than the meansdisclosed in my cited application. This simplicity arises from the factthat in my present application the calculating machine has but onetotalizer and therefore no reverse of a manual disconnect position isrequired since the manual disconnect may be obtained by the usualdisconnect lever 165 (Fig. 3) always present on the Wahl machine.

The automatic 88 t-up.

I shall now describe the means for actuating the rollers 123 and 128. Itwill be recalled that one of the objects of my improved machine is thepossibility of setting up a definite program of calculation on thecarriage, and having the motion of the carriage automatically'determinethe position of the gear shift rod 85 as the various zones ofcalculation are reached. As explained in the previous chapter, theautomatic shifting of the rod 85 is done through the agency of thecomplementary rollers 123 and 128. It is obvious that the roller 128,the bell crank 126 and the connecting link 124 could be suppressed and areturning s ring attached to the bell crank 120 to per orm the functionof the roller 128. However, I prefer the complementary rollerarrangement shown in Fig. 14 for the reason that in case one has areturning spring, the spring must be strong enough not only to shift themechanism when the return of the roller 123 is permitted by any of thecams, but must also have an excess of power so that the roller 123 ispromptly shifted at the proper time. By the provision of a pair ofcomplementary rollers the returning spring is done away with and thereresults less of an interference with the motion of the carriage than inthe arrangement employing a returning spring. I therefore have shown asthe preferred embodiment of my invention the complementary rollers 123and 128, but obviously a returning spring attached to the bell crank maybe used instead of the complementary system of rollers herein described.

The platen 39 is mounted on the typewriter carriage 166, which moves atright angles to the plane of the paper (Fig. 2) in suitable bearings 167and 168 rigid in the framework. The typewriter carriage is urged to theleft (Fig. 1) by the customa sprin tension arrangement not showii) and tis motion is controlled y the typewriter feed pinion 169, whose motionis controlled by the twin esca ment wheels 48, previously referred to.he escapement is of the well-known Remington form and need not befurther described.

- The typewriter carriage 166 is provided with a pair offorwardly-extending brackets 170 and 171, which serve to support the cambar 172 by screws 173 and 174, which engage elongated slots 175 and 176in said cam bar, to the end that while said cam bar is permitted nofreedom of motion parallelto the line of advance of the typewritercarriae 166, it may have motion in a plane at rig t angles thereto. Onaccount of the elongated nature of the slots 175 and 176, it isnecessary to support the cam bar at an intermediate point and to thisend I have provided a stud 177 rigid in the framework of the machine,said stud servin as a support for a pair of rollers 178 and 179 (Fig.2). Said rollers are independently mounted on the stud 177, that is, therollers 178 and 17 9 may each turn independently of the other.

The stud 177 (Fig. 2) is provided with an, eccentric bearing in theactuator castin 281 and is held in its position by a lodlcnut 289. Thisconstruction is for the purpose of permitting a vertical adjustment ofthe stud 177 to bring the rollers 178 and 179 into a position for theproper action of certain cams hereinafter to be described on thecomplementary rollers 123 and 128.

The cam bar 172, whose center section is clearly shown in Fig. 9, isprovided with a pair of V shaped ways 180 and 181, and conse uently isthereby constrained by the stud 1 7 against motion in any directionexcept parallel to the motion of the typewriter carriage 166. The resultof the arrangement just described is that the cam bar 172 floats on thestud 177 and is exactly constrained by said stud and associated rollersonly at the point in which said cam bar is in contact with the rollers178 and 179. At any other point the cam bar has a freedom of motion in aplane at right angles to the direction of motion of the carriage. Thestud 17 7 is located directly above the point of action of the comlementary rollers 123 and 128, and I am t us able to maintain thedistance between said rollers and the cams which actuate them with greatexactness. It is obvious that the said distance will not be altered byaccidental distortions of either the typewriter carriage 166 or thesupporting brackets 170 and 171.

I will now describe the mountin for the cams which actuate the compementary rollers 123 and 128: Mounted on the cam bar 172 are a series ofsup ortingframes 182, perspective views of w ich are 'ven in Figs. 12and 13, although views 0 the frames are shown in other fi res, forexample, Figs. 1, 3, 5 and 9. ese frames consist of a pair of sideplates 183 and 184,

which are heldtogether by tie plates 185, 186, 187 and 188, riveted inthe side plates. Extending between the side plates are also a pair of.tie rods 189 and 190. The cam bar 172 has'a-fin 191 ;(Figs. 1, 3 and 5)having a series of locating teeth 192 out in the bottom thereof. Theseteeth are located onetenth of an inch apart, the pitch of the typewriterescapement, and by their engagement with suitable notches 193 and 194 inthe sideplates 183 and 184 serve to locate the frames 182 in a definiteposition on the cam bar 172. The side plates 183 and 184 are held inengagement with the teeth through the medium of a pair of levers 195,which are rotatably mounted on the tie rod 190 and drawn downwardly bythe tension springs 197 and 198, extending between the levers 195 andthe tie rod 189. The levers 195 are provided with undersurfaces 199 and200, which are adapted to contact with the upper surface of the cam bar172 and thereby hold the plates 183 and 184-securely between thelocating teeth 192.

In case it is desired to shift the location of the supporting frames182, it can be easily done by pressing on the top bar 185. The springs198 and 199 'will yield, thus perinitting the sideplates 183 and 184 tobecome disengaged from the teeth 192. .The

frame 182 may then be slid along the bar 172 and be re-located inanother position. 1

The frames 182 form supports forv a set of cams 201 which serve tooperate the com-. 1

plementary rollers 123 and 128, and it is one of the objects of myinvention to make these 'carns so that they will be readily adjustable,that is, that the same cam may be adjusted to position the rollers in aposi-- tion corresponding to the addition, subtraction or disconnectpositions of the gear shift rod as may be desired. Referring particularly to Fig. 13, a cam 201 is shown disassembled from itssupporting frame. It will be noted that this cam consists of a block inwhich are two screw holes 202 and 203,

which are adapted to be held by the screws 204 and 205, which join thetie plates 186 and 187. The cam 201 has a pro ection, or fin, 206, saidfin being so positioned that when the cam 201 is mounted in the frame182, thelfin 206 will engage either the roller 123 or} the roller 128,asthe case may be- The block 201 is also provided with a surface 207,which is placed at a distance equalto the motion of one of the rollers123 -,or 128 from the surface of the fin 206. If the machine is to 0rate in addition, the fin 206'is so lacedt at it will contact with theroller 1 8, the roller 123 being raised' to contact with the comlementary. surface 207. In it is desired to 0 rate in subtraction, thescrews204 and 5 are withdrawn and the cam 201 is taken from the frameand turned end for end and then re- A disconnect position of the gearshift red I 85 corresponds to theposition in which the. complementary128 128 are at

